Enumerator Lists and Enumerated Arrays

// This file is part of EnumeratorLib
// Copyright: Andreas Raczek
// This file is published under the The Code Project Open License (CPOL) 
// See the file "CPOL.html" for the full license governing this code. 
#pragma once

namespace lobster {

namespace enm {

template<typename enum_array, int index> struct _at_rt;

template<
    typename enum_array, int index>
struct _at_rt {
    typedef typename copy_const<typename enum_array, typename enum_array::value_type>::type value_type;
    typedef typename copy_const<typename enum_array, typename enum_array::parent_array>::type parent_array;
    
    inline static value_type& value(enum_array& arr, typename enum_array::enum_type enum_value_test) {
        return enum_value_test == enum_array::enum_value ?
            arr._value
                :
            _at_rt<parent_array, parent_array::size-1>::value(arr, enum_value_test);  
    }
};

template<
    typename enum_array>
struct _at_rt <
    enum_array,
    0
> {
    typedef typename copy_const<typename enum_array, typename enum_array::value_type>::type value_type;
    
    inline static value_type& value(enum_array& arr, typename enum_array::enum_type enum_value_test) {
        if (enum_value_test != enum_array::enum_value) {
            throw std::out_of_range("_at");
        }
        return arr._value;
    }
};

}

}